Note: Descriptions are shown in the official language in which they were submitted.
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TOOL ASSEMBLY FOR MOUNTING OF A DENTAL PROSTHESIS AND
METHOD OF MOUNTING
Technical field
[0001] The present invention generally relates to techniques for the mounting
of
a dental prosthesis such as a crown, bridge or denture. The invention more
particularly relates to an improved tool assembly for mounting an abutment and
to
method of mounting an abutment.
Background Art
[0002] Dental implants are often used when a patient requires a prosthetic
device to hold one or more artificial teeth in place. Such implants are
typically
securely mounted to the jawbone, e.g. by surgical screws or other hygienic
fixing
means; and then, over a period, typically months, the bone and other tissue
are
permitted to grow around the implant.
[0003] A metal abutment may subsequently be securely fixed to the implant or a
base thereon, and then a dental prosthesis such as a tooth crown, dental
bridge or
dental construction e.g. manufactured using 3D printing, may subsequently be
securely fixed onto the abutment.
[0004] Typically, the metal abutment is fixed to the implant or a base thereon
by
means of screws or bolts - commonly called implant screws - , and tightened in
place using one or more tools.
[0005] In some configurations, it may be useful to provide an inclined
abutment
(angulated relative to the implant screw and thereby the implant), but this
may be
problematical since it makes it difficult or impossible to easily access the
head of
the implant screw with the usual (substantially straight) tool through the
angulated
abutment bore. There have been a number of attempts to try to overcome this
problem.
[0006] WO 2009/127880 describes an abutment / spacer element for use in a
dental implant assembly having a single aperture therethrough, the single
aperture
comprising an implant screw access bore and an offset abutment screw bore. The
implant screw access bore is designed such that, in use, the implant screw
access bore is
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substantially coaxial with the implant screw. The implant screw access bore is
inclined
relative to the implant or the implant screw. The degree of incline at which
the implant
screw access bore is inclined relative to the implant or the implant screw may
be from 0 to
degrees. The aperture defines a passage via which the implant screw is
accessible
and via which a substantially linear tool may be inserted along the
longitudinal axis of the
implant to engage and turn the implant screw to secure it to an implant. The
opening of
the aperture includes a notch or cut-away portion therein to facilitate
insertion of a tool and
the implant screw since the tool.
Technical problem
[0007] A problem is that, with known mounting/fixing tools and techniques, the
tools are not such as to be easily manipulated by a dentist in the dental
surgery,
making fixing of elements such as abutments securely in place more difficult.
Further, as the tool parts in question are of relatively small dimensions
(e.g. up to
30mm), the difficulty of manipulation raises the risk of the dentist's grip of
a tool
part being lost, of a tool part dislodging or falling, and even of a tool part
being
swallowed or even inhaled by a patient being treated.
[0008] It is an object of the present invention to provide mounting/fixing
tools
and mounting techniques enabling easy manipulation by a dentist, facilitating
secure fixing of elements such as abutments and/or reducing or minimizing the
risk of a tool part dislodging or free falling. This object is achieved by a
tool
assembly as claimed in claim 1, and the method of mounting a dental abutment
as
claimed in claim 15.
General Description of the Invention
[0009] In order to overcome the above-mentioned issue, the present invention
provides tool assembly for mounting a dental abutment to an implant or frame
having an axis of elongation (B). The tool assembly comprises a first tool,
the first
tool having an axis of elongation (A), a first end configured to engage, in
use, the
abutment, and a second end, at least a first portion of the first tool at or
near the
first end having a peripheral wall and, opposite the wall, a first opening
extending
along all or part of the first portion, wherein a second opening open in an
axial
direction is disposed at the first end. The tool assembly further comprises a
second tool having an axis of elongation (C) configured to releasably engage a
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fixing element. A contiguous space is defined between the first opening and
the
second opening whereby, in use, (i) the fixing element, or (ii) the fixing
element
attached to the second tool, may pass through the first opening and the second
opening to permit secure fixing of the abutment to an implant or frame using
the
second tool. There is an angle p between the axis of elongation B of the
implant
and the axis of elongation C of the second tool.
[0010] The axis B and C are offset / angulated / not coaxial / not coinciding
/ not
parallel. In an embodiment, the angle p between the axis of elongation B of
the
implant and the axis of elongation C is between 100 and 40 .
[0011] The
angle p is preferably larger than 11 , 12 ,14 ,16 ,18 , 20 , 22 , 24 ,
25 , 26 , 28 , 30 , 32 , 34 , 36 or 38 . The angle a is preferably smaller
than 37 ,
36 , 34 , 32 , 30 ,28 , 26 ,24 , 20 ,18 ,16 ,14 , 12 or 110
.
[0012] The
axis of elongation B of the implant is preferably substantially vertical,
i.e. in the direction of the natural teeth in the jaw.
[0013] In an
embodiment, the axis of elongation A of the first tool and the axis of
elongation B of the implant do not coincide / overlap. They are not parallel
preferably; there is an angle a between the axis of elongation A of the first
tool and
the axis of elongation B of the implant.
[0014] In an embodiment the angle a between the axis of elongation B of the
implant and the axis of elongation C is between 50 and 30 .
[0015] The
angle a is preferably larger than 6 , 8 , 10 , 11 ,12 ,14 ,16 ,18 , 20 ,
22 , 24 , 25 , 26 or 28 . The angle p is preferably smaller than 29 , 28 , 26
, 24 ,
20 ,18 ,16 ,14 , 12 , 10 , 8 or 70
.
[0016] Preferably, the axis A is perpendicular / at a 90 angle with regard to
the
plane of the implant screw access bore.
[0017] In an
embodiment, the axis of elongation C of the second tool does not
coincide with the axis of elongation A of the first tool. Preferably, there is
an angle
8 between the axis of elongation C of the second tool and the axis of
elongation A
of the first tool.
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[0018] In an embodiment the angle 8 between the axis of elongation A of the
first tool implant and the axis of elongation C of the second tool is between
5 and
15 .
[0019] The angle 8 is preferably larger than 6 , 8 , 10 , 11 , 12 or 14 .
The
angle 8 is preferably smaller than 14 , 12 , 10 , 8 , 7 or 6 .
[0020] The angle 13 is larger than the angle a. The angle 13 is larger than
the
angle 8. The angle a is larger than the angle 8.
[0021] A big advantage of the present tool assembly as compared to prior art
assemblies described in WO 2009/127880 resides in the fact that the second
tool
is held at an angle with regard to the axis of elongation of the implant and
the
abutment. This allows the second tool to be more easily manipulated in the
confined space of a buccal cavity. Indeed, if the second tool does not need to
be
aligned with the implant axis, it is much easier to fix the abutment to the
implant
since the second tool can be grasped and turned more easily especially if the
implant is in the back of the mouth.
[0022] Furthermore, the abutment used in the present tool assembly does not
require having a cut-out portion for the second tool to pass through, as in WO
2009/127880. Indeed since the abutment opening where the second tool passes
through is at angle with regard to the axis of the implant on which it is
fixed, there
needs to be a cut out as otherwise the screw and the tool would not be able to
be
inserted at all or very difficultly. The abutment thus does not have to be
made
especially for the tool. This makes it less complex and less expensive. The
tool of
the invention can be used basically with any abutment.
[0023] In an embodiment, the abutment is designed such that, in use, the
fixing
element is substantially coaxial with the implant. The second engagement
element
(i.e. the implant screw access bore) may however be inclined relative to the
implant
or the fixing element. The degree of incline at which the second engagement
element is inclined relative to the implant or the fixing element may vary,
but
preferably may be from 5 to 35 degrees. The second engagement element
cooperates with the first engagement element of the first tool to fix the
first element
on the abutment. The angle between the axis A and the second engagement
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element (i.e. the implant screw access bore) is preferably a 900 angle, more
preferably
an angle between 800 and 100 .
[0024] At least part of the wall of the first portion of the first tool has
preferably a
partial cylindrical form.
[0025] In embodiments, along said at least part the wall has a partial
cylindrical
form so that, when viewed in axial cross-section, an angle formed between
radii
joining the axis of elongation and each of the two circumferential ends of the
wall
is (i) 120 degrees or more, (ii) 150 degrees or more, 180 degrees of more, or
is
180 degrees. In other words, one side of the first portion of the first tool
has a cut-
away portion in the cylindrical part, such that, in situ, the cut-away portion
provides
access to the bore(s) of the abutment.
[0026] The partial cylindrical form is preferably disposed at or adjacent the
first
end.
[0027] Preferably, the first portion of the first tool extends part of the
length of
the first tool. In embodiments, the first portion of the first tool extends
(i) 30-60%,
(ii) 35-55%, (iii) 40-50%, (iv) 45-50% or (v) 50% of the length of the first
tool.
[0028] In an embodiment, a second portion of the first tool, formed by part of
the
first tool other than the first portion, comprises a manually-graspable
portion or is
configured to releasably engage a handle for manipulation by a user.
[0029] The wall comprises, when viewed in transverse cross-section, preferably
a rectangular portion at or adjacent the first end and a curved portion
adjacent the
second portion.
[0030] Preferably, the first portion of the first tool has a larger
transverse
dimension than that of the remainder of the first tool.
[0031] The tool assembly further comprises, in a preferred embodiment, at said
first end, at least one first engagement element configured for releasable
attachment to the abutment via cooperating at least one second engagement
element on the abutment. In an embodiment, the at least one first engagement
element comprises one of an external screw thread and an internal screw thread
and the at least one second engagement element comprises the other of an
external screw thread and an internal screw thread.
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[0032] The fixing element may comprise a bolt or screw configured for screwing
into the implant or frame.
[0033] The second tool comprises preferably, at a third end thereof, at least
one
third engagement element configured for releasable attachment to the fixing
element via cooperating at least one fourth engagement element on the fixing
element. In an embodiment, the cooperating at least one third engagement
element and at least one fourth engagement element comprise cooperating snap-
fix attachment elements.
[0034] According to another aspect of the present invention, there is provided
a
method of mounting a dental abutment to a dental implant or frame, comprising:
providing a tool assembly according to any of the preceding claims; releasably
attaching the first end of the first tool to the abutment; preferably
releasably
attaching the first tool together with the abutment releasably attached
thereto to
the implant or frame, releasably attaching the second tool to the a fixing
element;
passing the fixing element on the second tool through the first opening and
the
second opening; manipulating the second tool so as to attach the abutment to
the
implant or frame using the fixing element; and detaching the second tool from
the
a fixing element and removing the second tool through the second opening and
the first opening.
[0035] Finally the first tool is detached from the abutment.
[0036] The first tool may be pre-mounted through the first engagement element
onto the abutment and is used to carry/convey/transfer and position the
abutment
onto the implant.
[0037] An advantage of the invention is that the tool assembly and mounting
techniques enable easy manipulation by a dentist, facilitating secure fixing
of
elements such as abutments, and/or reducing or minimizing the risk of a tool
part
dislodging or free falling.
Brief Description of the Drawings
[0038] Further details and advantages of the present invention will be
apparent
from the following detailed description of a non-limiting embodiment with
reference
to the attached drawings, wherein:
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Figure 1 is a lateral view of a tool assembly according to an embodiment,
fully
assembled and attached to an abutment;
Figure 2 is a perspective view from above of the lower part of the tool
assembly of
Fig. 1;
Figure 3 is a lateral exploded view of the tool assembly of Fig. 1; and
Figure 4 is a lateral enlarged view of the junction between the lower part of
the tool
assembly of Fig. 1 and the abutment.
Description of Preferred Embodiments
[0039] In the following, like reference numerals denote like parts, and any
element, design feature or method step of any embodiment may be used in
combination with an element, design feature or method step of any other
embodiment unless stated otherwise herein.
[0040] Throughout the description and claims of this specification, the
singular
encompasses the plural unless the context otherwise requires. In particular,
where the
indefinite article is used, the specification is to be understood as
contemplating plurality as
well as singularity, unless the context requires otherwise.
[0041] Features, integers, characteristics, compounds or groups described in
conjunction with a particular aspect, embodiment or example of the invention
are to be
understood to be applicable to any other aspect, embodiment or example
described
herein unless incompatible therewith.
[0042] Throughout the description and claims of this specification, the
terms "aperture"
and "bore" include without limitation any aperture, opening, bore, channel,
passage or the
like.
[0043] Throughout the description and claims of this specification, the
terms "inclined",
"angulated" "offset", "not coinciding", and "not parallel" may be used
interchangeably to
refer to a component whose longitudinal axis, in use is not coaxial with the
longitudinal
axis of another component (for example a dental implant) with which the first
component
is to be used.
[0044] Unless indicated otherwise, the components described/illustrated herein
may be made of titanium or surgical steel, and/or may be fabricated using
turning
and/or machining.
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[0045] Figure 1 is a lateral view of a tool assembly 2 according to an
embodiment, fully assembled and attached to an abutment 4. As illustrated, an
implant 6 is configured to be rigidly attached to a frame (not shown) already
embedded in the jaw (not shown) of a patient, for example through a
cooperating
fixing element (not shown) engaging the implant 6 via a shaped recess 8.
Alternatively, the element labelled 6 may be formed by or constitute a base or
pillar integral with the frame (not shown).
[0046] The present invention is made in consideration of the requirement to
securely fix the abutment 4 to the implant 6 or frame when the implant 6 is
already
securely fixed in the jawbone. In a preferred embodiment, the abutment 4 and
the
implant 6 have abutting flat or form-fitting surfaces (not shown in Fig. 1),
as
indicated at 10.
[0047] In accordance with the invention, the tool assembly 2 includes a
first tool
12 and a second tool 14.
[0048] The first tool 12 has an axis of elongation A, a first end 16
configured to
engage, in use, the abutment 4, and a second end 18. At least a first portion
20 of
the first tool 12 at or near the first end 16 has a peripheral wall 22. In
embodiments, the peripheral wall 22 may have a thickness up to a few mm, e.g.
up to 3 mm, and/or may be up to 10% of the diameter of the first portion 20.
[0049] In the first portion 20 of the first tool 12, and opposite the wall
22, a first
opening 24 extends along all or part of the first portion 20.
[0050] The axis of elongation A of the first tool 12 coincides with the axis
of the
aperture, opening or second engagement element 42 of the abutment 4. The axis
of elongation A of the first tool 12 and the axis of elongation B of the
implant 6
(and the abutment 4 when it is mounted to the implant) do not coincide /
overlap.
There is an angle a of between 5 and 35 between these two axes.
[0051] The axis of elongation B of the implant 6 (and the abutment when it is
mounted on the implant) is substantially vertical. When the implant 6 is
mounted in
a substantially vertical position in the jawbone, the first tool 12 is
extending /
projecting at an angle a into the buccal cavity of the patient. It can thus be
easily
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grasped and manipulated and mounted to the implant by the dentist together
with
the second tool.
[0052] In the context of the invention, "substantially vertical" is
understood as
the same angle as natural teeth set in the jaw and which protrude in the
buccal
cavity at a substantially vertical angle.
[0053] It may however be that the implant is implanted in the jaw at an angle
which deflects from the vertical, depending on the configuration of the
implant or
denture that is fixed to the implant and on other factors like the bone
quality of the
jaw, the number of implants, the position of the implant in the mouth (upper
jaw,
lower jaw, front teeth back teeth) etc..
[0054] One disadvantage of the configuration as shown on fig. 8 of WO
2009/127880 is that the two tools ¨ the handle and the screwdriver - are in
the
each other's way when in use since the screwdriver must be inserted "behind"
the
handle when seen from the point of view of the dentist who installs said
abutment
in the mouth of a patient. This makes it difficult to tighten the screw since
the
handle is in the way. In the present configuration however, the two tools are
not in
the each other's way. The second tool (the screwdriver) is inserted via "the
front"
of the first tool ¨ i.e. oriented towards the buccal cavity. It can thus be
easily
inserted while the first tool is in place. The screwdriver can be turned
without the
handle being in the way as in fig. 8 of WO 2009/127880.
[0055] Referring briefly to Fig. 2, this is a perspective view from above
of the
lower part of the tool assembly 2 of Fig. 1. A second opening 26 that is open
in an
axial direction is disposed at the first end 16. In embodiments, the second
opening
26 is circular in shape.
[0056] In accordance with the invention, the second tool 14 is configured to
releasably engage a fixing element 28, as discussed in further detail
hereinbelow.
[0057] Referring to Figs 1 and 2, a contiguous space 30 is defined between the
first opening 24 and the second opening 26 such that, in use, (i) the fixing
element
28, or (ii) the fixing element 28 attached to the second tool 14, may pass
through
the first opening 24 and the second opening 26 to permit secure fixing of the
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abutment 4 to an implant 6 or frame using the second tool 14, as discussed in
further detail hereinbelow.
[0058] Returning to Fig. 1, in an embodiment, at least part 32 of the wall 22
has
a partial cylindrical form. More particularly, in embodiments, along the at
least part
32 of the wall 22 has a partial cylindrical form so that, when viewed in axial
cross-
section, an angle formed between radii joining the axis of elongation A and
each of
the two circumferential ends of the wall 22 is (i) 120 degrees or more, (ii)
150
degrees or more, 180 degrees of more, or is 180 degrees. In an embodiment, the
part 32 with the partial cylindrical form is disposed at or adjacent the first
end 16.
[0059] In an embodiment, the first portion 20 of the first tool 12 extends
part of
the length of the first tool 12. More particularly, in embodiments, the first
portion 20
of the first tool 12 extends (i) 30-60%, (ii) 35-55%, (iii) 40-50%, (iv) 45-
50% or (v)
50% of the length of the first tool 12.
[0060] In embodiments, the at least part 32 of the wall 22 comprises, when
viewed in transverse cross-section, a rectangular portion at or adjacent the
first
end 16.
[0061] In an embodiment, a second portion 34 of the first tool 12, formed by
part
of the first tool 12 other than the first portion 20, comprises a manually-
graspable
portion or is configured to releasably engage a handle (not shown) for
manipulation by a user. In embodiments, the first portion 20 comprises, when
viewed in transverse cross-section, a curved part 36 adjacent the second
portion
34.
[0062] In embodiments, the first portion 20 of the first tool 12 has a
larger
transverse dimension (e.g. diameter) than that of the remainder of the first
tool 12,
e.g. the second portion 34. For example, the first portion 20 may have a 100-
300%
larger transverse dimension (e.g. diameter) than that of the remainder of the
first
tool 12 so that the second tool can be inserted therethrough and have space to
jiggle / wiggle.
[0063] Figure 3 is a lateral exploded view of the tool assembly 2 of Fig.
1. In an
embodiment, the first tool 12 includes, at the first end 16, at least one
first
engagement element 36 configured for releasable attachment to the abutment 4
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via a cooperating at least one second engagement element 42 on the abutment 4.
The first engagement element 36 may comprise an engagement ring 38 upon
which an external screw thread 40 is provided, and/or the second engagement
element 42 may comprise a hollow internal ring section 44, e.g. upon which an
internal screw thread (not shown) is provided. In alternative embodiments, an
internal screw thread is provided on the engagement ring 38, and/or an
external
screw thread (not shown) is provided on the internal ring section 44.
[0064] Via the first opening 24 defined by the wall 22, the second opening 26
defined by the engagement ring 38, and the internal ring section 44, the
fixing
element 28 (preferably attached to the second tool 14, as shown in Fig. 3),
can be
advanced from the exterior of the first tool 12 by the user into a chamber 46
defined within the abutment 4.
[0065] In embodiments, at or near an end 48 of the abutment 4 opposite to the
internal ring section 44 the abutment 4 includes external formations 50, e.g.
in the
shape of a hex nut, for engaging a correspondingly shaped recess (not shown)
in
the implant 6, in order for the abutment 4 to be received in the implant 6 in
an
immovable (i.e. non-rotatable) manner.
[0066] As seen in Fig. 3, the second tool 14 may comprise, at a third (distal)
end
52 thereof, at least one third engagement element 54 configured for releasable
attachment to the fixing element 28 via cooperating at least one fourth
engagement element 56 on the fixing element 28. At the end of the fixing
element
28 opposite to the fourth engagement element 56, the fixing element may have
an
external screw thread 58 or other attachment element, for fixedly engaging a
corresponding attachment element (e.g. internal screw thread) within the
implant 6
or frame.
[0067] In embodiments, the fixing element 28 comprises a bolt or screw
configured for screwing into the implant 6 or frame. In embodiments, the
cooperating at least one third engagement element 54 and at least one fourth
engagement element 56 comprise cooperating snap-fix (click-fix) attachment
elements. That is, the third engagement element 54 (e.g. a ball having
multiple
outwardly biased projections) may be configured to enable the distal end 52 of
the
second tool 14 to be snapped into fourth engagement element 56 (e.g. a bolt
head
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having an internal recess or recesses for receiving the ball and/or
projections; not
shown).
[0068] EP 3 541 318¨ integrated herein by reference - describes a combination
of a screw for a surgical application, and a driver for driving the screw for
fastening
an orthopaedic implant either to a bone or to an orthopaedic implant, in
particular a
dental component to a dental implant that can be used for the present purpose.
[0069] Figure 4 is a lateral enlarged view of the junction between the lower
part
of the tool assembly 2 of Fig. 1 and the abutment. The first tool 12 has
releasably
engaged the abutment 4 such that the at least one first engagement element 36
has (e.g. screw-threadedly) engaged the cooperating at least one second
engagement element 42 on the abutment 4. The third engagement element 54 has
engaged the fourth engagement element 56, enabling the fixing element 28 to be
pushed down (in the direction of arrow B) into the abutment 4 and implant 6.
Thereafter, by the user twisting the (proximal end 59) of the second tool 14
(opposite the distal end 52, the user can screw the fixing element 28 into the
implant 6 or frame.
[0070] In an embodiment, such movement (and screwing in, in the direction of
arrow B) is limited by a conical section 60 coming into contact with shoulder
62 on
the abutment 4.
[0071] Thus, in accordance with an embodiment, a method of mounting a dental
abutment using the tool assembly described above and illustrated herein is as
follows (to an extent, the order of the steps may be varied). First, the first
end 16 of
the first tool 12 is releasably attached to the abutment 4. Then, the second
tool 14
is releasably attached to the fixing element 28. Next, the fixing element 28
is
passed on the second tool 14 through the first opening 24 and the second
opening
26. The user then inserts both tools in the buccal cavity and positions the
abutment on the implant. The user can hold both tools in between the thumb and
the index finger and easily bring them in position without risk of dropping
the screw
or the abutment. The user then manipulates the second tool 14 so as to attach
the
abutment 4 to the implant 6 or frame using the fixing element 28. Finally, the
second tool 14 is detached from the fixing element 28 and the second tool 14
removed through the second opening 26 and the first opening 24. Finally the
first
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tool 12 is detached from the abutment 4. If the user wants to take the
abutment out
again, he will apply the above steps in reverse order.
[0072] While embodiments have been described by reference to embodiments
of survey devices having various components in their respective
implementations,
it will be appreciated that other embodiments make use of other combinations
and
permutations of these and other components.
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Legend:
2 tool assembly 44 internal ring section
4 abutment 46 chamber
6 implant 48 end of the abutment
8 recess 50 external formations
abutting surfaces 52 third (distal) end of second tool
12 first tool 54 third engagement element
14 second tool 56 fourth engagement element
16 first end 58 external screw thread
18 second end 59 proximal end
first portion of the first tool 60 conical section
22 wall 62 shoulder
24 first opening a angle between the axis of elongation A
of the first tool and the axis of elongation
B of the implant
26 second opening 13 angle between the axis of elongation B
of the implant and the axis of elongation C
of the second tool
28 fixing element 8 angle between the axis of elongation A
of the first tool implant and the axis of
elongation C of the second tool
contiguous space A axis of elongation A of the first tool
32 part of the wall B axis of elongation of the implant
34 second portion of the first tool C axis of elongation of the second
tool
36 first engagement element
38 engagement ring
external screw thread
42 second engagement element
